[RFC] cygport documentation

[Andrew Schulman]

> > Several people have mentioned changes they would like to see in 
> > cygport's documentation.  I believe the stable APIs are all documented 
> > now, but what more would you like to see in the docs?
> 
> I'd like to see an explanation and an example or two of what cygclasses are for.

Also:  

* How to build 32- and 64-bit packages

* How to get cygport to create preinstall and postinstall scripts and setup.hint
files for you